RuntimeError: failed to execute ['dot', '-Tpdf', '-O', 'test'], make sure the Graphviz executables
在python中想用graphviz畫圖的時候，發現報瞭如下異常：
RuntimeError: failed to execute ['dot', '-Tpdf', '-O', 'test'], make sure the Graphviz executables are on your systems' path
很奇怪啊。python裡面明明已經安裝好了graphviz。。。
經過google搜尋，發現是系統也需要安裝graphviz。。。
sudo apt-get install graphviz
系統安裝graphviz完畢以後，程式碼就可以正常執行。
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